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Turbulence instabilities and passive scalars in rotating channel flow
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-9819-2906
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-2711-4687
2011 (Engelska)Ingår i: 13th European Turbulence Conference (ETC13): Instability, Transition, Grid Turbulence And Jets / [ed] K. Bajer, Institute of Physics Publishing (IOPP), 2011, s. 032025-Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Fully developed channel flow with a passive scalar rotating about the spanwise axis is studied by direct numerical simulations. The Reynolds number based on the bulk mean velocity Re-b is up to 30000, substantially higher than in previous studies, and the rotation rates cover a broad range. Turbulence on the stable channel side is less strongly damped at moderate rotation rates than in channel flow at lower Re-b. At high rotation rates and sufficiently high Re-b, intermittent strong instabilities occur on the stable side caused by rapidly growing modes resembling two-dimensional Tollmien-Schlichting waves which at some instant become unstable and break down into intense turbulence. The turbulence decays and after some time the waves form again and the process is repeated in a cyclic manner. Rotation also strongly affects the mean passive scalar profiles and turbulent scalar fluxes. Large scalar fluctuations are observed on the border between the stable and unstable channel sides. While in non-rotating channel flow the turbulent Prandtl number of the passive scalar is about one like in other shear flows, it is much smaller in the rotating cases.

Ort, förlag, år, upplaga, sidor
Institute of Physics Publishing (IOPP), 2011. s. 032025-
Serie
Journal of Physics: Conference Series (Print), ISSN 1742-6588 ; 318
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-86797DOI: 10.1088/1742-6596/318/3/032025ISI: 000301336300025Scopus ID: 2-s2.0-84856348063OAI: oai:DiVA.org:kth-86797DiVA, id: diva2:501027
Konferens
13th European Turbulence Conference. Warsaw. 12 - 15 September 2011
Anmärkning
QC 20120410Tillgänglig från: 2012-02-13 Skapad: 2012-02-13 Senast uppdaterad: 2012-04-26Bibliografiskt granskad

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Brethouwer, GeertSchlatter, PhilippJohansson, Arne

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